package com.czg.mybatisplus.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.czg.mybatisplus.dao.BookMapper;
import com.czg.mybatisplus.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl extends ServiceImpl<BookMapper, Book> implements BookService {
    @Autowired
    BookMapper bookMapper;
    @Override
    public List<Book> searchBooks(Book book) {
        QueryWrapper queryWrapper=new QueryWrapper();
        if(book.getAuthor()!=null && book.getAuthor()!=""){
            queryWrapper.like("author",book.getAuthor());
        }
        if(book.getName()!=null && book.getName()!="") {
            queryWrapper.like("name",book.getName());
        }
        if(book.getCategory()!=null && book.getCategory()!="") {
            queryWrapper.eq("category",book.getCategory());
        }


//        LambdaQueryWrapper<Book> lambdaQueryWrapper=new LambdaQueryWrapper();
//        if(book.getAuthor()!=null && book.getAuthor()!="") {
//            lambdaQueryWrapper.like(Book::getAuthor, book.getAuthor());
//        }
//        if(book.getName()!=null && book.getName()!="") {
//            lambdaQueryWrapper.like(Book::getName, book.getName());
//        }
//        if(book.getCategory()!=null && book.getCategory()!="") {
//            lambdaQueryWrapper.eq(Book::getCategory, book.getCategory());
//        }
        return bookMapper.selectList(queryWrapper);
    }

    @Override
    public IPage getPage(Integer pageNum) {
        IPage page=new Page(pageNum,3);
      return bookMapper.selectPage(page,null);
    }

}
